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TM 9-2320-312-24-2
Testing and Adjusting Section
Excessive oil consumption can also be the result if
oil with the wrong viscosity is used. Oil with a thin
viscosity can be caused by fuel leakage into the
crankcase or by increased engine temperature.
i01283115
Increased Engine Oil
Temperature - Inspect
SMCS Code: 1348-040
When the engine is at operating temperature
and you are using SAE 10W30 oil, the maximum
oil temperature is 115 C (239 F). This is the
temperature of the oil after passing through the oil
cooler.
Look for a restriction in the oil passages of the oil
cooler. The oil temperature may be higher than
normal when the engine is operating. In such
a case, the oil cooler may have a restriction. A
restriction in the oil cooler will not cause low oil
pressure in the engine.
Determine if the oil cooler bypass valve is held in
the open position. This condition will allow the oil to
pass through the valve instead of the oil cooler. The
oil temperature will increase.

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